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Finding the Fourth Proportional to 71,787.72, 107,687.05 and 21,872.08

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Solution

The fourth proportional to 71,787.72, 107,687.05 and 21,872.08 is: 32,809.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,787.72 : 107,687.05 = 21,872.08 : x
  2. Step 2: Convert to fraction form
    71,787.72/107,687.05 = 21,872.08/x
  3. Step 3: Cross multiply
    71,787.72x = 107,687.05 × 21,872.08
  4. Step 4: Simplify right side
    71,787.72x = 2,355,339,124.77
  5. Step 5: Solve for x
    x = 2,355,339,124.77/71,787.72
  6. Step 6: Final answer
    x = 32,809.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.